you need to implement the following things: 1-A generic List interface, which encapsulates the ADT for a list data structure. And these are the functions in the interface -public T getFirst () -public ListNode getFirstNode () -public T getLast (); -public void insertFirst (I data ); -public void insertAfter ( ListNode currentNode ,T data ); -public void insertLast (T data); -public void deleteFirst (; -public void deleteLast(): -public void deleteNext ( ListNode currentNode ); -public int size(): -public boolean isEmpty(); 2-A generic LinkedList class, which implements List interface (Please explain little with comments)